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TM 10-3930-671-24
5.
Do not repair chains by cutting out the worn sec tion
and joining in a new piece.
6.
If part of a chain is worn, replace all the chains or the
truck.
Lift Chain Inspection and Wear Criteria
NOTE
Take measurement while chain is under
tension when lifting a small load.
1.
New Chain Length - The distance from the firs pin
counted to the last pin counted in a span while the
chains are lifting a small load.
2.
Worn Chain Length - See (1) above.
3.
Span - The number of pins in the length (segment,
of chain to be measured, including the first one.
4.
Pitch - The distance from the center of one pin to
the center of the next pin.
Figure 4. Measuring chain for wear, using tape measure.
Table of Chain Dimensions
Leaf Chain
Chain No.
Pitch
Span
Worn Chain Length
BL800
1.00 in. (25.4 mm)
13
12.375 in. (314.3 mm)
Lift Chain Replacement
1.
All chains must be replaced if any strand has
wear of 3% or more, or if any of the chain-
damage conditions noted previously are found
during inspection.
2.
Replace all chains as a set (in pairs). It is
impossible to keep a balanced loading and wear
life between chains if a new chain is put into
service opposite an old chain. Inequities
between the new and the older, worn chain will
cause problems in keeping chain tension equal,
accelerated wear, and probable early failure.
3.
Order replacement chains as required.
4.
Do not remove the factory lubrication from new
chains. It helps prevent wear and corrosion. If
the original lubricant has dried or been removed,
apply lubricant as specified in Lubrication Order
(Appendix B).
5.
Do
not
paint
new
chain
before
or
after
installation. Paint may help prevent corrosion,
but will also prevent lubricant from reaching the
pins for good joint lubrication.
6.
Carefully
inspect
the
chain
anchors
and
sheaves. Broken, cracked, or worn anchors
must be replaced. Replace worn sheaves, and
check the sheave bearings for wear.
7.
Use new anchor pins when installing new chains.
8.
Adjust the tension on new chains.
9.
Lubricate chains when they are installed on the
upright.
Fork Removal
1.
Release the fork latches and move each fork to
the notch on bottom of carriage.
F-500
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